/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package io.seata.server.storage.redis.lock;

import io.seata.common.ConfigurationKeys;
import io.seata.config.Configuration;
import io.seata.config.ConfigurationFactory;
import io.seata.core.lock.Locker;

import static io.seata.common.Constants.STORE_REDIS_TYPE_PIPELINE;

/**
 * @author conghuhu
 */
public class RedisLockerFactory {

    private static final Configuration CONFIG = ConfigurationFactory.getInstance();

    /**
     * The locker.
     */
    private static volatile Locker locker;

    public static Locker getLocker() {
        if (locker == null) {
            synchronized (RedisLockerFactory.class) {
                if (locker == null) {
                    String storeRedisType = CONFIG.getConfig(ConfigurationKeys.STORE_REDIS_TYPE, STORE_REDIS_TYPE_PIPELINE);
                    locker = STORE_REDIS_TYPE_PIPELINE.equals(storeRedisType) ? new RedisLocker() : new RedisLuaLocker();
                }
            }
        }
        return locker;
    }
}
